Bone conduction speaker



FIG. 1 is a perspective view of a wearing part of the bone conduction speaker showing our new design;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a left view thereof;

FIG. 5 is a right view thereof;

FIG. 6 is a top view thereof; and,

FIG. 7 is a bottom view thereof.

The broken lines depict environment that forms no part of the claimed design. 

CLAIM The ornamental design for a bone conduction speaker, as shown and described. 